I asked pretty much the same question a couple of years ago, you'll probably find the answers satisfactory to what you're looking for.
Big ups to @AcidSmiley@hexbear.net for a very well thought out response 
this post was submitted on 26 Oct 2024
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many thanks comrade
poland was fascist before the USSR and now it's fascist after the USSR
There's lot to be said about it, but my bet would be that the huge skydive in material conditions following the collapse is the biggest contributing factor combined with the liberal anticommunist propaganda by the local ruling class as well as the foreign, CIA etc.
Another example is Germany, fascism is emerging today right where East Germany used to be, a socialist country that fell to the control of the capitalists and became one more western pawn to be exploited. Poor material conditions combined with a lack of a revolutionary party to provide a meaningful and organized direction for all that discontent, naturally leads to fascism through its populist strategies that pretend to fight against the status quo.